Bulk and surface structure investigation for the positive electrodes of degraded lithium-ion cell after storage test using X-ray absorption near-edge structure measurement

Daisuke Mori, Hironori Kobayashi, Masahiro Shikano, Hiroaki Nitani, Hiroyuki Kageyama, Shinji Koike, Hikari Sakaebe, Kuniaki Tatsumi

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Cylindrical lithium-ion cells with a lithium-nickel-cobalt-aluminum oxide (LiNi0.8Co0.15Al0.05O2) and a non-graphitizable carbon (hard carbon) as the positive and negative electrodes, respectively, were degraded by the storage tests with 50% state-of-charge (SOC). The degraded cells were disassembled and positive electrodes obtained were examined. The cation distribution of lithium and nickel in the positive electrode was clarified using neutron and synchrotron X-ray diffraction measurements. The degree of lithium and nickel disordering varied with the storage condition. X-ray absorption near-edge structure (XANES) analysis demonstrated that the structural change was mainly located near the surface of the positive electrode and the valence state of Ni and Co ions did not change with the storage test. The disordering of the cations near the surface was closely related to the power fade of the cell. The storage condition is an important factor in the power fade of lithium-ion cells.

Original languageEnglish
Pages (from-to)676-680
Number of pages5
JournalJournal of Power Sources
Volume189
Issue number1
DOIs
Publication statusPublished - Apr 1 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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